centages shown in the accompanying chart are those 

 most commonly found in retail products. 



To prepare a spray, mix one of the products with 

 water in the proportion indicated in the chart. Apply 

 the finished spray as follows : 



Small areas. — To treat a lawn, campsite, or other 

 small area, use a cylindrical compressed-air 

 sprayer or a knapsack sprayer. Apply 2y 2 to 3 

 quarts per 1,000 square feet (25 to 35 gallons per 

 acre). 



Large areas. — To treat a park, golf course, or 

 other large area, use a power sprayer. To get uni- 

 form coverage, apply twice as much spray material 

 as you would with a small sprayer, but do not add 

 insecticide. Double the amount of spray material 

 by adding water. Apply 50 to 70 gallons per acre. 



An emulsion spray prepared and applied according 

 to these recommendations is effective 4 to 8 weeks ; a 

 wettable-powder spray, 2 to 6 weeks. A spray is con- 

 sidered effective for a stated period if few or no 

 active chiggers can be found in the treated area dur- 

 ing that period. 



Dusts 



Apply 5-percent chlordane or toxaphene dust at 

 the rate of 40 to 50 pounds per acre (1 to 1% pounds 

 per 1,000 square feet), and 1-percent lindane dust 

 at the rate of 25 to 50 pounds per acre (10 ounces to 

 iy 4 pounds per 1,000 square feet) . A dust treatment 

 is effective 1 to 4 weeks. 



Dusts can be applied with any equipment that is 

 used for dusting plants. A rotary hand duster is 

 excellent for treating small areas. A power duster 

 is better for large areas. 



If you have any questions about the repellents or 

 insecticides discussed in this leaflet, consult your 

 county agent or an entomologist in your State exten- 

 sion service or experiment station; or write to the 

 Entomology Research Branch, Agricultural Research 

 Service, U. S. Department of Agriculture, Plant In- 

 dustry Station, Beltsville, Md. 



This leaflet was prepared by the Entomology Research 



Branch, Agricultural Research Service. It supersedes Leaflet 



302, Chigger Control. 



Washington, D. C. Issued March 1956 



. 5. GOVERNMENT PRINTING OFFICE 1956— 0363664 



